perf: minimise asset data size

[woodenfurniture]

Description

Minimizes the size of generatedAssetData.json by a factor of 3x.

TODO:

• Fix stale relatedAssetKey issue upstream
• Remove full dataset unit test
• Consume sortedAssetIds in redux
• Encode common prefix of icon URLs for another 2x gain (total 6x reduction)
• Encode relatedAssetIndex using the encoded assetIds

Issue (if applicable)

closes #8188

Risk

High Risk PRs Require 2 approvals

High risk.

What protocols, transaction types, wallets or contract interactions might be affected by this PR?

Testing

Engineering

Operations

• 🏁 My feature is behind a flag and doesn't require operations testing (yet)

Screenshots (if applicable)